Drawing-pen.



0. HAFF.

DRAWING PEN.

APPLICATION nun SEPT. 9, 1907.

905,419. Patented Dec. 1, 1908.

1n: NORRIS Plrslis Eli, wAsnmutou, n c.

UNITED STATES PATENT OFFICE.

OTTO HAFF, OF PFRONTEN, GERMANY, ASSIGNOR TO THE KEUFFEL & ESSER COMPANY, OF

HOBOKEN, NEW JERSEY, A CORPORATTON OF NEW JERSEY.

DRAWING-PEN.

Specification of Letters Patent.

Patented Dec. 1, 1908.

To all whom it may concern:

Be it known that I, Or'ro HAFF, a citizen of the Kingdom of Bavaria, and a subject of the King of Bavaria, residing at Pfronten,

. Bavaria, Germany, have invented certain new and useful Improvements inDrawing- Fens, of which the following is a specification.

The subject of the present invention is drawing pens and especially that type thereof having a spring blade and a fixed blade and provided with means for adjustably fixing the blades apart at the different distances required for the different thicknesses of lines which are to be produced and which means is adapted to permit the blades to be opened to their widest extent for cleaning purposes without in anywise altering the adjustment of the blades which it has been set to produce, so that after the blades have been cleaned they may be restored to their former position, for use, without requiring readjustment.

The adjusting means which may be most conveniently employed comprises a head carried by an element which is adjustably mounted upon one of the blades, the head engaging the other blade, and the parts so associated that relative movement between the adjusting means and the blade which the head engages may be effected, without changing the extent to which the head has been set to project from the blade which carries the adjusting means. i

It is a leading purpose of the present invention to provide a drawing pen with an adjusting means having the characteristics mentioned and which will contain, and be associated with, elements whereby it may be carried by the fixed blade of the pen, instead of by the movable blade thereof, will be effectively prevented from accidental displacement from the position to which it has been set and will have provision for a most convenient reengagement of the parts after the blades have been cleaned.

To these ends the invention consists in certain peculiarities in the construction and ar rangements of parts, substantially as hereinafter described and particularly pointed out in the subjoined claims.

In the drawings, Figure l is a side elevation of a drawing pen embodying this inven= tion: Fig. 2 isan enlarged side elevation and partial central section of the same with the adjuster in place and the pen ready for use: Fig. 3 is a view similar to that shown in Fig. 2 but with the catch of the adjuster disengaged from the movable blade and Fig. 4 is a perspective view of the adjuster catch and a part of the tension spring.

In the drawings, 10 is the handle of a drawing pen made of any suitable size and material, for instance, horn or ivory, and 11 is the base thereof into which the handle is securely fitted. The base is milled at 12 to form a roughened surface to give a firm hold to the fingers of the operator. Made integral with or firmly secured to the basell are the two blades of the instrument, 13 being the fixed blade and lt the movable blade.

The adjuster 20 comprises a screw-threaded stem 21 adapted to pass loosely through an aperture 15 in the fixed blade and pr vided with a catch having a head 25 which engages the outer surface. of the movable. blade 14. The stem 21 is engaged by a nut 22 provided with a milled head 23, which is arranged outside the fixed blade and when turned moves the stem and head in one or the other direction as required. The catch has, in addition to the head 25, an angular shank 24 of a thickness approximately the same as the transverse diameter of the aperture 16 in the movable blade of the pen, through which it extends, whereby it is held against rotative movement which would change the adjustment. The aperture 16 referred to is of greater length than that of the shank 24: so that the adjusting device may be tilted sufiiciently to free its head 25 from the blade 14;, the aperture 15 in the fixed jaw being also of such shape relative to the bar 21 as to provide a clearance space adjacent to said bar in order to permit such tilting movement of the adjuster. The adjusting means is further held against rotative movement by a spring 17, one end of which is secured to the fixed blade 13. The other end of the spring is formed with an elongated aperture 18, in which the shank of the ad usting means is slidably mounted, and this aper ture is preferably open ended for conveii= .ieiice in assembling and disassembling the parts. The forked end of the spring, thus formed, engages pins 26 which project laterally from the shank 24. p I

It will be observed that the pins 26 are arranged eccentricall'y of .the catch, being here shown as near the upper forward corner of the shank, whereby the'tendency of the spring 17 is to press the catch toward the handle as well as away from the fixed blade. The head of the catch, therefore, is held in the path of a wall of the'aperture 16 when the pen is open for cleaning purposes and the catch is also held (when the pen is closed) against accidental movement in a direction which would disengage it from the movable blade. At the same time the movable relation of the catch with the spring is such that the spring in no wise interferes with the pivotal movement of the catch in its adjustment to free the movable blade and in its movement to reengage the latter.

Attention is called to the fact that the confronting surfaces of the head 25 and rear Wall of the aperture 16' are correspondingly beveled and are so related to each other when the pen is fully opened that they will be engaged during the operation of pressing the movable blade toward the fixed blade. In this operation, the head 25 will be moved forward against the tension of the spring 17, until it has passed through the aperture 16 and is engaged with the outer surface of the movable blade, whereby its reengagement with the movable blade is effected by the simple operation of pressing the movabl blade toward the fixed blade.

In using the device, suppose that the parts have been assembled, as shown in Fig. 2, the catch 20 is engaging the movable blade 14 which has been adjusted with respect to the blade 13, by the thumb nut 23, the spring 17 serving to keep the catch pressed against the blade 14. Now suppose that the operator desires to clean the blades: he slips the head 26 of the catch 20 until it is opposite the aperture 16 when its engagement with the blade 14 ceases and the parts are in the position shown in Fig. 3 and access is given to the blades and they may readily be cleaned.

WVhen it is desired to reassemble the parts, the blades 18 and 14 are pinched together until the catch 20 is reengaged with the blade 14. It is obvious that unless the thumb nut 23 has been turned in the meantime the blades must now be the same distance apart as before.

lVhat I claim is 1. In a drawing pen, a fixed blade and a movable blade, one of which is provided with an aperture, a catch carried by one blade and having a head adapted to pass through the aperture in the other blade, and a spring for pressing the catch toward the latter blade, said spring engaging the catch near one side of the latter and said catch having tilting movement relatively to the spring.

2. A drawing pen having fixed and movable blades, and means for holding the same in predetermined positionwith relation to each other, comprising an adjustable catch mounted upon one blade, the other blade having an aperture through which the head of the catch extends, said catch having an angular portion, and means arranged between the blades and engaging the angular portion of the catch and preventing rotative movement of the latter.

3. A drawing pen having a fixed blade and a movable blade, and means for holding the same in predetermined relation with each other, comprising a catch carried by one of the blades and provided with an angular portion, and a spring which presses the catch toward the other blade and has an aperture the walls of which engage the angular portion of the catch.

4. In a drawing pen, a blade, a non-rotative catch adjustably mounted thereon, said catch having a head and an angular portion, a second blade having an aperture through which said head is adapted to pass, and a spring which presses the catch toward the secondblade and has an aperture in which the angular portion of the catch is fitted, the head of said catch adapted to engage the external surface of the second blade when the blades are in position for use.

5. A drawing pen having a first and a second blade, one movable relatively to the other and each provided with an aperture, a catch having a stem which extends through the aperture in the first blade and a head which extends through the aperture in the second blade and engages the outer surface of the latter blade, means engaging the stem of the catch and serving to secure the catch adjustably to the first blade, and a spring which presses the catch toward the second blade, said catch being movable relatively to the spring and having its head so related to a wall of the aperture in one of the blades, when the blades are opened, that the catch will be moved relatively to the spring by said wall in the closing of the blades.

6. A drawing pen having a movable blade provided with an aperture, a fixed blade, a non-rotative adjustable catch carried by the fixed blade and having a head adapted to pass through the aperture in the movable blade and to engage the outer surface of the latter, and a spring which presses the catch toward the movable blade said catch being movable relatively to the spring and having its head arranged in the path of movement of a wall of the aperture and adapted to be engaged thereby to cause automatic movement of the catch.

7 A drawing pen having a movable blade and a fixed blade, one of which is provided with an aperture, a catch carried by one blade and having a head adapted to pass through the aperture in the other blade and to engage the external surface of the latter when the blades are in position for use, said catch having eccentrically arranged projections, means for adjusting the catch and a spring engaging said projections and pressing the catch toward the apertured blade.

8. A drawing pen having a movable blade provided with an aperture, a fixed blade, a catch adjustably secured to the fixed blade and provided with an angular portion to extend movably through said aperture and a head to engage the outer surface of the movable blade, said angular portion having lateral projections and a spring which is arranged between the blades and engages the projections and has an elongated aperture which receives the angular portion of the catch.

9; A drawing pen having a movable blade and a fixed blade, one of which is provided with an aperture, a catch carried by one blade and having a head adapted to pass through an aperture in the other blade and to engage the external surface of the latter when the blades are in position for use, said catch having an angular portion provided with eccentrically arranged projections, a spring engaging said projections and having an aperture the walls of which engage the angular portion of the catch, and adjusting means for the catch.

Vitness my hand this 7th day of Aug. 1907, at the city of Munich, Bavaria.

OTTO HAFF.

Witnesses:

ANTON ZWENG, Tor. BAPTIST Rrs'r. 

